Article Overview
Cable tray support spacing and specifications depend on tray type, material, load class, and installation environment.
Typical Cable Tray Support Specifications
| Tray Type | Material | Load Class / Rating | Maximum Support Span | Notes / Installation Guidelines |
|---|---|---|---|---|
| Ladder Tray | Steel / Stainless Steel | Light, Medium, Heavy | 1.5–3 m (5–10 ft) depending on load | Supports mounted on walls, ceilings, or floors; rung spacing 150–230 mm recommended for instrumentation cables |
| Solid Bottom Tray | Steel / Aluminum | Light, Medium | 1–2.5 m (3–8 ft) | Provides protection against dust and electromagnetic interference; solid cover recommended for heat-sensitive cables |
| Ventilated Tray | Steel / Aluminum | Light, Medium | 1.5–3 m (5–10 ft) | Allows airflow to prevent heat buildup; suitable for power and control cables |
| Wire Mesh / Channel Tray | Steel / Stainless Steel | Light | 1–2 m (3–6 ft) | Ideal for light instrumentation and control cables; flexible routing; supports every 1–2 m |
Key Considerations for Cable Tray Supports
- Material and Finish: Steel trays may be pre-galvanized, hot-dip galvanized, or stainless steel (AISI 316L) for corrosion resistance; aluminum trays offer high corrosion resistance and lighter weight .
- Load Class: Defines the maximum weight the tray can carry over a given span. Light, medium, and heavy load classes are used to select support spacing .
- Support Spacing: Determined by tray type, material, and load. Ladder and ventilated trays typically allow longer spans than solid or wire mesh trays .
- Mounting Options: Trays can be mounted on floors, walls, ceilings, or equipment racks. Modular systems allow easy configuration for new or existing installations .
- Rung Spacing: For ladder trays, 6–9 inches (150–230 mm) is recommended to maintain cable support and prevent sagging .
- Environmental Conditions: Consider ambient temperature, humidity, and corrosive environments when selecting material and finish .
References for Detailed Specifications
- Legrand Cable Tray Technical Guide provides material, finish, and load recommendations .
- OBO CMS Guide outlines DIN EN 61537 compliance, support elements, and installation practices .
- Eaton and Hubbell catalogs provide load class tables, support spans, and accessory specifications for ladder and tray systems .
- ABB Technical Guide details corrosion-resistant materials and environmental considerations . This table and guidelines provide a comprehensive reference for selecting cable tray supports, ensuring proper load handling, spacing, and compliance with industry standards.
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